On above textarea you can type hindi using english letter in a way you speak it. This make typing in hindi natural. As you type in english character it will be automatially translated into hindi alphabets.
For e.g., "main tumase pyaar karata hoon" becomes "मैं तुमसे प्यार करता हूँ"

When you press the backspace or click on any words a dropdown menu will appear containing more choice that are relevant to the word you just typed.

Use keyword combination of (CTRL + G) to toggle between English and Hindi.